Event Bus Overall document

docs/en/Event-Bus.md

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 # Event Bus
 
-TODO
+An event bus is a mediator that transfers a message from a sender to a receiver. In this way, it provides a loosely coupled communication way between objects, services and applications.
+
+## Event Bus Types
+
+ABP Framework provides two type of event buses;
+
+* **[Local Event Bus](Local-Event-Bus.md)** is suitable for in-process messaging.
+* **[Distributed Event Bus](Distributed-Event-Bus.md)** is suitable for inter-process messaging, like microservices publishing and subscribing to distributed events.